Shaft-binder.



PATENT-ED SEPT. 25, 1906.

G. P. FRAZEE.

SHAFT BINDER. APPLICATION FILED SEPT. 16, 1904. RENEWED JUNE 22, 1906.

UNITED STATES PATENT OFFICE.

SHAFT-BINDER.

Specification of Letters Patent.

Patented Sept. 25, 1906.

Application filed fieptember 16,1904. Renewed June 22, 1906. Serial No. 322,968.

To all whont it may concern:

Be it known that I, CAssrus FREMONT FRAZEE, a citizen of the United States, and a resident of Portland, in the county of Multnomah, State of Oregon, have invented a new and useful Shaft-Binder for Split Pulleys, of Which the following is a specification, reference being had to the accompanying drawings as constituting a part thereof.

My invention relates to what is generally known as a divided or split pulley and to the means for fixedly securing such pulley on the shaft. As is well known, pulleys of this type are generally provided with wooden bushing, inserted in the eye of the pulley, and are clamped onto the shaft. contact between the outer face of the wooden bushing and the material encompassing the eye of the pulley is of such character as to render any slip between these parts impossible but the inner face of the bushing in contact with the shaft is subject to some slip, and finally results in the pulley becoming loose upon the shaft. It is this defect which I overcome by myinvention below described.

My invention further has for its object to provide shaft-binder means of inexpensive construction, readily applied and adapted to be used on all sizes and types of split pulleys now commonly in use.

In the drawings, Figure 1 is an elevation of a divided or split pulley and a section of the shaft on which the same is mounted and shows my invention in its preferred form of construction practically applied to bind the pulley on the shaft. Fig. 2 is a perspective of one segment or part of my shaft-binder of the preferred form or construction. Fig. 3 shows a plan of the lower half part or segment of the wooden bushing, on which are placed two of my shaft-binders of the preferred construction, one near each end of the bushing in position to bear upon the shaft, as hereinafter described. Fig. 4 shows a shaftbinder made with points instead of ribs, as shown in the precedingfigures, suchpoints being substantially arranged and designed to serve the same purposes as the ribs of the preceding type of shaft-binder.

Referring now to the letters as designating the parts described, in Fig. 1 a a represent the two halves or segments of the rim of a The surface common split pulley b l), the two segments or halves of the arm. 0 c are the bolts by which the parts are clamped together on the shaft, and d d the two segments of the bushing. The shaft is designated 0.

While my invention was more particularly designed for use in connection with wooden pulleys, it is self-evident from the description hereinafter given that the same is equally serviceable on any system of metal bushing used on split pulleys.

In its preferred form of construction my shaft-binder consists of two segments or strips of steel 6 6 made in the form shown in Fig. 2-that is to say, the segments are made of semicircular shape in the middle part and have laterally-projecting extremities or lips g g. The segments are made of strips of steel about one inch wide and one sixteenth of an inch thick. In the middle portion are made integral knife-edged ribs f, preferably three in number, one in the center and the other two disposed on either side of and equidistant from the middle rib. The portion of the segments on which the ribs f f f are made is hardened, and the ribs are so arranged that the apex or upper cutting-line of all the ribs in both the upper and lower segments e eare adapted to draw toward each other on parallel lines, as indicated by the dotted lines :20 x as in Fig. 1.

The advantage of the described construction with respect to the ribs f is obvious. Since the compression caused by the tightening of the nuts on the bolts 0 0 produces forces directly opposing each other from above and below, the ribs f by being arranged in correspondence with the direction of such forces are adapted to embed themselves in the periphery of the shaft in an effective manner.

For pulleys of small size and also for shafts of small diameter a single central rib would answer; but in order to insure a perfectly rigid grip of the pulley on its shaft I prefer to use three ribs, for the reason that with three ribs f on each segment of the shaft-binder the shaft traveling in either direction would be in contact with the substantially straight face of one or the other of the laterally-disposed ribs. For example, if the shaft were traveling to the right it would have such contact with the rib on the left of the central rib of the upper segment 6 and with. the rib on the right of the lower segment 0 of the shaftbinder, this effect being due to the laterallydisposed ribs f being made and arranged, as above stated, to draw upon the periphery of the shaft in parallel lines 00 as x.

The distance between the ribs on either side of the center rib is relatively controlled by the diameter of the shaft. The laterallydisposed ribs should be arranged as close to the center rib as practical in order to receive as nearly as possible the maximum compression force when drawing the two sections of pulley together.

The segments a c are made about one inch widethat is to say, comparatively narrow for the reason not only of economizing metal, butin order to concentrate the compression forces, and thereby to facilitate the penetration and embedding of the ribs into the surface of the shaft. If a shaft-binder of the construction shown in Fig. 2 were made of a width equal to the length of the bushing, the resistance offered to the ribs would be too great to allow the same to effectually embed themselves into the shaft. I therefore make this type of shaft-binder of narrow segments of the construction shown in Fig. 2 and arrange these on the two segments of the bushing approximately as shown in Fig. 3. Not less than two sets of shaft-binders or segments 6 e can be used. in any case, and this number is increased relatively to the width of the face of the pulley.

The bushing-segments used in connection with my shaft-binder just described are of the ordinary construction. The diameterof the inner circle or eye thereof corresponds to the outer circle of the segments 12 e for any given diameter of the shaft. The projecting extremities or lips g g of the strap-binder (see Figs. 1 and 2) perform a particular function. By means thereof the strain. on the bushing incidental to the pulley-segments being compressed on the shaft is equalized and the splitting of the bushing is prevented. The material of the arms I) b, encompassing the bushing-segments d d, effectually constrains the sides of said segments against spreading, and by the provision. of said extremities g g the ends-(Z of the bushing-segments are supported so as to receive the compression strain in advance of the middle portion of said segments, and thus the grain of the bushing is held together.

In Fig. 4 is shown a shaft-binder of similar construction as that previously described; but in this type of construction the ribs f are replaced by conical points 'i. My idea in showing this figure was merely to illustrate a possible modification of the described type of my shaft-binder.

One of the advantages of shaft-binders made of segments 6 e is that no recessing of the inner faces of the bushing-segments is required.

In the arranging or lining up of the pulley shaft-binders of the type shown in Fig. 2 are apt'to be moved out of their proper places. To avoid this, I make the extremities or lips g g with. slots or apertures 1), through which to drive a tack or other retaining-pin 1".

Having fully described my invention, what I claim, and desire to secure by Letters Patent, is

1. A fastening for split pulleys consisting of strap-like binder-segments, each being made with an intermediate body portion curved to embrace a segment of the periphery of the shaft, and having on its inner face an integral projection or projections adapted to be embedded in the surface of the shaft, and being further made with laterally-projecting extremities, arranged to support the ends of the bushing-segments for the purpose of distributing the strain imposed thereon when clamping the pulley on the shaft, and also to hold the binder-segments in place.

2-. A fastening for split pulleys consisting of strap-like binder-segments, each being made with an intermediate body portion curved to embrace a segment of the periphery of the shaft, and having on its inner face a plurality of integral projections, arranged. to bear on the periphery of the shaft inparallel lines for the purpose described; and being further made with laterally-projecting extremities arranged to support the ends of the bushing-segments for the purpose of distributing the strain imposed thereon when clamping the pulley on the shaft, and also to hold the bindensegments in place.

3. A fastening for split pulleys consisting of strap-like binder-segments, each being made with an intermediate body portion curved to embrace a segment of the periphery of the shaft and having on its innner face an integral projection or projections, adapted to be embedded in the surface of the shaft, and being further made with laterally-projecting extremities, arranged to support the ends of the bushing-segments for the purpose of distributing the strain imposed thereon. when clamping the pulley on the shaft; and also to hold the binder-segments in place, and said extremities of the binder seginents being further adapted. to be fastened by retainingpins to the ends of the bushing-segments, to hold the parts in place while lining up the pulley.

4. In a split pulley the combination with the bushing-segments and the shaft of straplike binder-segments arranged in pairs between opposed faces of the bushings and the shaft, each binder-segment being made with an intermediate body portion curved to embrace a segment of the periphery of the shaft,

and having on its inner face an integral pro- In testimony whereof I have hereunto jection or projections, engaging with the surafiixed my signature in the presence of two [0 face oflthe shaft and being further made ulrith Witnesses.

lateral y-projeeting extremities, arrangec to support the ends of the bushing-segments for CASSIUS FREMONT FRAZEE' the purpose of distributing the strain imposed Witnesses:

thereon, and also to hold the binder-segments 'T. J GEISLER,

in place. RALPH R. DUNIWAY. 

